Youth (noun)

1. The period between childhood and adult age.
2. The qualities or characteristics associated with young people, such as energy, enthusiasm, and a lack of experience.
3. Young people collectively.

Origin:

Old english geoguth, of germanic origin; related to dutch jeugd and german jugend.

Examples:

1. He is in the prime of his youth.
2. She is full of the energy and enthusiasm of youth.
3. The youth of the country are its future.
4. The program is designed for the youth of the community.
5. Youth is often wasted on the young.